Journal of Geophysical Research Oceans,
Journal Year:
2025,
Volume and Issue:
130(4)
Published: April 1, 2025
Abstract
Hydrodynamic
sorting
processes
control
the
transport
of
marine
sediments
in
benthic
environments
marginal
seas,
affecting
distribution
associated
microbes
and
organic
carbon
(OC)
composition
sediments.
However,
microbial
characteristics
variations
their
impacts
on
OC
stability
during
hydrodynamic
remain
insufficiently
understood.
Here,
we
analyzed
concentrations
isotopes
phospholipid
fatty
acids
(PLFAs),
conducted
thermal
analysis
grain‐size
fractionated
retrieved
along
classical
pathway
from
Yellow
River
delta
to
Sea.
We
find
that
relative
abundance
anaerobic
bacterial
PLFAs
has
positive
correlations
with
proportion
pre‐aged
negative
refractory
compounds,
bioavailable
become
more
limited
pathway.
suggest
decreasing
increasing
may
facilitate
bacteria,
metabolism
can
utilize
resuspension
The
attached
produce
by‐products
including
OC,
which
promote
burial
environments,
important
environmental
implications
such
as
sequestration
seas
Abstract
Microbe-mineral
interactions
play
a
fundamental
role
in
marine
sediments
and
global
biogeochemical
cycles.
Here,
we
investigated
the
sediment
microbial
communities
two
contrasting
field
sites
on
Big
Island,
Hawaii
(USA),
that
differ
their
bay
morphology
grain
size
distributions:
Papakōlea
Beach
(exposed,
finer
sediment)
Richardson
Ocean
Park
(sheltered,
coarser
sediment).
We
selected
three
stations
within
each
characterized
mineral
chemical
composition
of
porewater,
used
16S
rRNA
amplicon
sequencing
V4V5
hypervariable
region
to
investigate
naturally
occurring
communities.
Microbial
community
structure
differed
significantly
between
bays,
rather
than
bay,
whereby
diversity
was
markedly
lower
at
compared
Richardson.
correlated
environmental
variables
order
identify
key
drivers
differences
bays.
Our
study
suggests
differing
physico-chemical
properties
resulting
from
morphologies
geophysical
drivers,
are
main
factors
influencing
these
is
‘green
sand’
beach,
due
its
high
olivine
content.
This
site
broader
context
campaign
investigating
as
source
for
ocean
alkalinity
enhancement
(OAE),
carbon
dioxide
removal
technology.
results
highlight
complexity
environments,
with
implications
monitoring,
reporting
verification
future
trials
involving
addition
enhancement.
Microorganisms,
Journal Year:
2025,
Volume and Issue:
13(5), P. 1050 - 1050
Published: April 30, 2025
Benthic
microbial
communities
are
a
vital
component
of
coastal
subtidal
zones,
playing
an
essential
role
in
nutrient
cycling
and
energy
flow,
fundamental
to
maintaining
the
stability
functioning
marine
ecosystems.
However,
response
benthic
prokaryotic
eukaryotic
environmental
changes
remains
poorly
understood.
Herein,
we
conducted
nearly
semimonthly
annual
sampling
survey
investigate
temporal
patterns
underlying
mechanisms
sediments
Sanshan
Island,
situated
eastern
Laizhou
Bay
Bohai
Sea,
China.
The
results
showed
that
variations
followed
distinct
seasonal
pattern,
with
turnover
more
dominant
community
succession.
Nonetheless,
contrasting
were
observed
alpha
diversity
communities,
as
well
taxa
across
different
communities.
Water
temperature,
dissolved
oxygen,
electrical
conductivity,
salinity,
total
nitrogen
(TN),
NH4+,
PO43−
identified
predominant
drivers.
assembly
was
driven
by
ecological
processes,
which
stochastic
processes
mainly
shaped
while
deterministic
dominated
Interactions
within
primarily
characterized
mutualistic
or
cooperative
relationships,
but
ability
maintain
under
disturbances
notable
differences.
These
shed
light
on
dynamics
potential
driving
disturbances,
highlighting
roles
zones
providing
valuable
insights
for
management
conservation
